Microphone device, microphone unit, microphone structure, and electronic equipment using these

Abstract

A microphone unit which can suppress collection of wind noise and minimize or eliminate digital signal processing has at least a microphone, a first acoustic transmissive material, and a second acoustic transmissive material, the first acoustic transmissive material is a fiber material in which fibers are intertwined with each other, the second acoustic transmissive material is a mesh-like member or a porous member having a plurality of holes, and the microphone is configured to be protected by the first acoustic transmissive material and the second acoustic transmissive material in this order.

The invention claimed is: 
     
       1. A microphone device comprising:
 a housing having a microphone installation chamber opening outward; 
 a microphone stored in the microphone installation chamber; 
 a cover member having a plurality of through holes and covering the microphone installation chamber; and 
 an acoustic transmission member partitioning the microphone installation chamber into a first space on the cover member side and a second space on the microphone side and, at the same time, transmitting an acoustic component, 
 wherein the acoustic transmission member includes a fiber material obtained by intertwining raw materials, configured to contain fiber, with each other and air permeability of the fiber material is less than 0.5 s/100 cm 3 , and 
 wherein the fiber material is sintered or is bonded together by thermal fusion bonding. 
 
     
     
       2. The microphone device according to  claim 1 , wherein the fiber is metal fiber or fluorine fiber. 
     
     
       3. The microphone device according to  claim 1 , further comprising an elastic member disposed at least one of between the housing and the microphone, between the cover member and the microphone, and between the acoustic transmission member and the microphone and attenuating or blocking vibration transmitted to the microphone through the housing, the cover member, or the acoustic transmission member. 
     
     
       4. Electronics mounted with the microphone device according to any one of  claims 1  to  3 . 
     
     
       5. The electronics according to  claim 4  being an imaging device in a form in which a photographer holds a device housing set to a horizontal direction with one hand, and the microphone device being disposed on the photographer side relative to a holding position of the device housing. 
     
     
       6. The microphone device according to  claim 1 , wherein the cover member comprises a mesh of size 5 to 100 mesh and hole diameter of the mesh is 0.1 to 3.0 mm. 
     
     
       7. The microphone device according to  claim 1 , wherein the cover member has lower impedance than the acoustic transmission member. 
     
     
       8. A microphone structure comprising:
 a microphone; 
 a cover member having a plurality of through holes; and an acoustic transmission member interposed between the cover member and the microphone and transmitting an acoustic component, 
 wherein the acoustic transmission member includes a fiber material obtained by intertwining raw materials, configured to contain fiber, with each other, and air permeability of the fiber material is less than 0.5 s/100 cm 3 , and 
 wherein the fiber material is sintered or is bonded together by thermal fusion bonding. 
 
     
     
       9. The microphone structure according to  claim 8 , wherein the fiber is metal fiber or fluorine fiber. 
     
     
       10. The microphone structure according to  claim 8 , further comprising an elastic member disposed at least one of between the cover member and the microphone and between the acoustic transmission member and the microphone and attenuating or blocking vibration transmitted to the microphone through the cover member or the acoustic transmission member. 
     
     
       11. The microphone structure according to  claim 8 , wherein the microphone is mounted to the acoustic transmission member. 
     
     
       12. Electronics mounted with the microphone structure according to any one of  claims 8  to  11 . 
     
     
       13. The electronics according to  claim 12  being an imaging device in a form in which a photographer holds a device housing set to a horizontal direction with one hand, wherein the microphone structure is disposed on the photographer side relative to a holding position of the device housing. 
     
     
       14. The microphone structure according to  claim 8 , wherein the cover member comprises a mesh of size 5 to 100 mesh and hole diameter of the mesh is 0.1 to 3.0 mm. 
     
     
       15. The microphone structure according to  claim 8 , wherein the cover member has lower impedance than the acoustic transmission member. 
     
     
       16. A microphone structure comprising at least a microphone, a first acoustic transmissive material, and a second acoustic transmissive material, wherein
 the first acoustic transmissive material is a fiber material in which fibers are intertwined with each other, 
 the second acoustic transmissive material is a mesh-like member or a porous member including a plurality of holes, 
 the microphone is protected from incoming noise first by the second acoustic transmissive material and then by the first acoustic transmissive material, 
 and air permeability of the fiber material is less than 0.5 s/100 cm 3 , 
 wherein the fiber material is sintered or is bonded together by thermal fusion bonding. 
 
     
     
       17. The microphone structure according to  claim 16  having a wind whistling sound reduction effect of not less than Δ20 dBA with respect to wind having a wind speed of 2.7 m/s. 
     
     
       18. The microphone structure according to  claim 16 , wherein the first acoustic transmissive material is installed through an elastic member. 
     
     
       19. The microphone structure according to  claim 16 , wherein the microphone is mounted to the first acoustic transmissive material. 
     
     
       20. The microphone structure according to  claim 16 , wherein the fiber is metal fiber or resin fiber having a fiber diameter of 1 to 50 μm. 
     
     
       21. The microphone structure according to  claim 16 , wherein in the first acoustic transmissive material, Taber stiffness is not less than 5 mN·m, bending resistance is not less than 100 mN, porosity is not less than 50%, and thickness is not more than 3 mm. 
     
     
       22. The microphone structure according to  claim 16 , wherein the microphone is installed on a microphone cushion formed of an elastic member, and the first acoustic transmissive material and the second acoustic transmissive material are not fixed onto the microphone cushion. 
     
     
       23. The microphone structure according to any one of  claims 16  to  22 , wherein insertion loss is not more than 5 dB in each 1/1 octave bands of 63 Hz to 8 kHz. 
     
     
       24. The microphone structure according to  claim 16 , wherein the second acoustic transmissive material comprises a mesh of size 5 to 100 mesh and hole diameter of the mesh is 0.1 to 3.0 mm. 
     
     
       25. The microphone structure according to  claim 16 , wherein the second transmissive material has lower impedance than the first transmissive material.